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Additional Resources

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Frequently Asked Questions View all FAQs
How do you order the correct replacement parts?

Before ordering replacement parts, make sure you have the fan model and serial number.

Where can I find instructions to wire a motor on my fan?

The nameplate of the motor includes a wiring diagram. Wiring diagrams can also be found beneath the motor image in our Buy Parts section. Simply click the wiring diagram icon to view it.

Can I install a thermostat?

Yes, but only if the thermostat has a simple on/off operation. Please note: if the thermostat varies the amount of voltage delivered, it will damage the motor and void the warranty.

Can I install my whole house fan vertically?

Comfort Cooler (CC) series whole-house fans may be mounted vertically, however, the AS and CSS shutters will not function properly in the vertical position. We do not carry a ceiling shutter for vertical installation. Vertical installation instructions.

Quality Products

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JD Series Direct Drive Upblast Exhaust Fans

QUALITYProducts.
SINCE 1948.

JD Series Direct Drive Upblast Exhaust Fans

Triangle Engineering’s JD Series direct drive upblast fans provide reliable roof-mounted exhaust with minimal maintenance. Built with heavy-gauge welded steel housings, galvanized curb bases, and non-overloading cast aluminum airfoil blades, the JD line delivers efficient, high-volume airflow for industrial and commercial facilities. The direct drive configuration eliminates belts and pulleys, reducing wear and service needs while ensuring smooth, dependable operation.

Available in diameters from 24″ to 72″ with motor options up to 25 HP, JD fans move up to 90,000 CFM and are ideal for manufacturing plants, foundries, warehouses, and utility rooms. Each unit is finished with a corrosion-resistant powder coat and equipped with integral butterfly dampers, rain channels, and reinforced windbands to withstand the elements. Backed by more than 70 years of American manufacturing expertise, the JD Series is a proven choice for long-lasting, maintenance-friendly rooftop ventilation.

Optional upgrades for high-temperature use for crypto mining and data centers or specialized materials further extend their capabilities, making JD Series fans a dependable choice for challenging industrial applications.

  • All-Welded Steel Construction
    Withstands harsh industrial conditions and ensures long-term durability.
  • Direct-Drive Configuration
    Eliminates belts and pulleys, simplifying maintenance and improving energy efficiency.
  • High-Efficiency Airfoil Propellers
    Cast aluminum, non-overloading airfoil blades move air effectively with minimal noise or turbulence. Conventional flat blades cause excessive air turbulence which results in motor overloads and poor acoustic performance.
  • Multiple Motor Options
    Standard (Totally Enclosed, Hazardous Location) and non-standard (Chemical Duty, 50 Hz, Arctic Duty, IEEE 841, ECM) configurations to match diverse environments.
  • Rugged Weather Protection
    Heavy-gauge windband, curb base, and reinforced components for reliable performance in any climate.
  • Proven Heritage
    Backed by more than 70 years of Triangle Engineering’s innovation and expertise.

Sizes & Models (24″–72″)

  • Standard Blade Diameters: 24″, 30″, 36″, 42″, 48″, 54″, 60″, 72″
    (Consult factory for larger diameters)
  • Airflow Range: up to 90,000 CFM (contact us for larger airflow requirements)
  • Horsepower: Up to 25 HP (contact us for higher horsepower requirements)

Standard Motor Types, Voltages & Controls

  • Standard Motor Options: Totally Enclosed (TE), Hazardous Location (HL)
  • Non-Standard: Chemical Duty, 50 Hz, Arctic Duty, High Ambient, IEEE 841, Electronically Commutated (ECM), etc.
  • Standard Voltages:
    • Single-Phase: 115V, 230V
    • Three-Phase: 230V, 460V
    • (Additional options: 277V, 208V, 415V, 575V)
  • Motor Control: Consult factory for motor compatibility with Variable Frequency Drives (VFD’s)

Operating Range

  • Temperature: Handles up to 110°F (contact us for higher-temp motors)
  • Static Pressure: Refer to performance tables for model-specific capabilities

Construction & Finish

  • Housing: Heavy-gauge, all-welded steel for structural integrity
  • Polyester Powder Coat Finish: Resists corrosion, extends product life
  • External Bracing: Reinforces larger units to prevent sagging and vibration
  • Internal Bracing: Adds extra structural support
  • Rain Channel: Directs rainwater away from the fan onto the roof

Additional Construction Details

  • Curb Base: Heavy-gauge galvanized sheet steel, all-welded for long, maintenance-free service
  • Windband: Galvanized steel with formed reinforcing ribs, braced to protect against weather and crosswinds
  • Throat: Deep venturi-type orifice riveted to a galvanized steel inner throat for quieter, more efficient operation
  • Butterfly Dampers: Automatically open when powered on and close via gravity to prevent backdrafts; bumper stops aid closure
  • Damper Bearings: Sintered bronze-oil bushings on rustproof rods, located outside the airstream for friction-free operation
  • Neoprene Bumper: Creates a tight damper seal, prevents freezing in cold conditions, and dampens noise as lids close
  • Lifting Lugs: Facilitate easier rigging and safer rooftop installation

Mounting & Installation

  • Motor in Airstream: Simplifies servicing and inspection
  • Integral Butterfly Dampers: Minimize energy loss by reducing backdrafts when fan is off

Explore a range of add-ons and design modifications to further enhance functionality, reliability, and ease of maintenance. Whether you need additional weatherproofing, improved service access, or robust safety features, our suite of accessories ensures the JD Series meets the unique demands of your industrial environment.

  • Disconnect Switch: UL-listed, prewired switch for on-site safety
  • Magnetic Latches: Help prevent butterfly damper uplift due to high winds
  • VFD Ready: Premium Efficiency Inverter-Rated Motor
  • Shaft Grounding: Minimizes bearing wear from stray electrical current

When it comes to keeping diverse work environments safe, comfortable, and compliant, the JD Series Direct Drive Upblast Exhaust Fan delivers consistent performance across many industrial and commercial sectors. From busy manufacturing floors to demanding utility rooms, these fans provide robust, efficient ventilation wherever it’s needed most. Below are several examples of applications that can benefit from the JD Series’ rugged design and minimal-maintenance advantages.

  • Manufacturing Plants: Remove fumes, heat, and particulates for a safer workspace
  • Warehousing & Distribution: Sustain fresh air exchange in large, busy buildings
  • Foundries & Metalworking: Vent smoke, dust, and heavy industrial byproducts
  • Power & Utility Rooms: Ensure proper cooling of electrical equipment
  • Beverage & Food Processing: Maintain sanitation standards by controlling humidity and odors
  1. Reliability: With robust construction and direct-drive efficiency, downtime is minimized.
  2. Superior Performance: Non-overloading airfoil blades deliver steady, high-volume airflow.
  3. Minimal Maintenance: No belts to adjust or replace, reducing service intervals.
  4. Flexible Customization: Tailor horsepower, voltage, and optional accessories to meet specific site needs.
  5. Decades of Expertise: Triangle Engineering’s proven track record in industrial ventilation stands behind every unit.

Complement or extend your ventilation system with these premium solutions:

We understand every project has distinct ventilation challenges. Beyond our standard JD Series offerings, our team is available to work with you to fine-tune specific performance, material, and site specific criteria. Whether you require specialty finishes, enhanced components for high temperatures, or specific airflow targets, our engineering team is prepared to deliver a tailored JD Series configuration.

Custom Airflow Targets

We’ll identify the ideal propeller or blade design to meet your specific static pressure and performance needs, ensuring optimal airflow and efficient operation for your application.

High-Temperature Applications

Upgrade components and materials to withstand extreme operating conditions, factoring in reduced air density at high temperatures. We’ll also adjust propeller selection as needed to maintain proper airflow and performance.

MATERIAL OPTIONS

CHOOSE FROM STANDARD STEEL, ALUMINUM, OR STAINLESS STEEL FOR ENHANCED CORROSION RESISTANCE OR LIGHTER WEIGHT.

Have additional requirements? Looking for a unique finish or custom mounting configuration? Our experts can help you explore all possible solutions to fit your exact needs.

Details

  • Direct drive
  • Available in 24” to 60” diameters.
  • Polyester powder coat finish
  • Motor is inside the airstream
  • All welded construction gives long maintenance-free service
  • Heavy gauge galvanized sheet steel curb base.
  • Cast aluminum airfoil blades mounted on heavy duty cast aluminum fixed pitch hub for quiet, efficient operation
  • Galvanized sheet steel wind band with two formed reinforcing ribs for protection from weather and cross winds
  • Galvanized steel inner throat is riveted to the deep venturi-type orifice for quieter, more efficient operation
  • EXTERNAL BRACING used on larger units to give extra rigidity, prevent sagging, and vibration
  • DAMPER LID opens/closes automatically when fan is turned on/off
  • Adjustable neoprene tipped positive bumper stops assure closure of damper lids when fan is cut off, yet permit maximum air flow when open

See full specifications for sizing and performance data

View Full Specs

Hazardous Location Models

Hazardous location models are made to order and are not returnable.

  • No wiring
  • Non-sparking aluminum blades
  • Stationary motor mounts
  • Direct drive: consult factory for motor rating